Docs: (EE Port) Merge 4 EE doc/user/project dirs to CE

doc/user/project/packages/maven_repository.md

@@ -12,7 +12,7 @@ project can have its own space to store its Maven artifacts.
 
 NOTE: **Note:**
 This option is available only if your GitLab administrator has
-[enabled support for the Maven repository](../../../administration/packages.md).
+[enabled support for the Maven repository](https://docs.gitlab.com/ee/administration/packages.html).**[PREMIUM ONLY]**
 
 After the Packages feature is enabled, the Maven Repository will be available for
 all new projects by default. To enable it for existing projects, or if you want

doc/user/project/packages/npm_registry.md

@@ -20,7 +20,7 @@ within a subgroup is not supported yet.
 
 NOTE: **Note:**
 This option is available only if your GitLab administrator has
-[enabled support for the NPM registry](../../../administration/packages.md).
+[enabled support for the NPM registry](https://docs.gitlab.com/ee/administration/packages.html).**[PREMIUM ONLY]**
 
 After the NPM registry is enabled, it will be available for all new projects
 by default. To enable it for existing projects, or if you want to disable it:

doc/user/project/settings/index.md

@@ -44,7 +44,7 @@ Set up your project's merge request settings:
 
 ### Service Desk **[PREMIUM]**
 
-Enable [Service Desk](../service_desk.md) for your project to offer customer support.
+Enable [Service Desk](https://docs.gitlab.com/ee/user/project/service_desk.html) for your project to offer customer support.
 
 ### Export project
 
@@ -129,6 +129,6 @@ namespace if needed.
 
 Configure Error Tracking to discover and view [Sentry errors within GitLab](../operations/error_tracking.md).
 
-### Jaeger tracing
+### Jaeger tracing **[ULTIMATE]**
 
 Add the URL of a Jaeger server to allow your users to [easily access the Jaeger UI from within GitLab](../operations/tracing.md).